print("Let's practice everything.")
print('You\'d need to know \' about escapes with \\ that do:')
print('\n newlines and \t tables.')

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explanation
\n\t\twhere there is none.
"""

print("--------------")
print(poem)
print("--------------")

five = 10 - 2 + 3 - 6
print(f"This should be five: {five}")

def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans / 1000
    crates = jars / 100
    return jelly_beans, jars, crates

start_porint = 10000
beans, jars, crates =secret_formula(start_porint)#将返回的值依次赋予三个变量

#remember that this is another way to format a string
print("With a starting point of: {}".format(start_porint))
#it's just like with an f"" string.
print(f"We'd have {beans} beans, {jars} jars, and {crates} crates.")

start_porint = start_porint / 10

print("We can also do that this way:")
formula = secret_formula(start_porint)#第二种使用函数的方法， 直接将三个返回值给到一个变量，之后根据函数体内定义的变量来返回值
#this is an easy way to apple a list to a format string 
print("We'd have {} beans, {} jars, and {} creates.".format(*formula))